PSU choice for 6 * Sapphire Radeon RX Vega 56 Nitro+ mining rig

[marathonic]

I'm awaiting an order of six Sapphire Radeon RX Vega 56 Nitro+ graphic cards which, unfortunately, need 3 x eight-pin PCIe power connections each.

I believe the rig should be fine if powered by two 1200w PSU's and am just trying to figure out which to order.

If I can get away with the Corsair HX1200i, I'll go ahead and order two of those:



Alternatively, I'll splash out the extra cash and go for two of the EVGA SuperNOVA 1200 P2:



The second PSU above seems to have an extra PCIe slot available.

I'm new to this but would I be okay to power three cards off each HX1200i? I'd use a 6 pin periph slot on the PSU for each of the risers. One of the eight pin slots would be needed for the CPU and five leftover would be used as follows:

1: To splitter and onto GPU 1 slot 1 and 2
2: To splitter and onto GPU 2 slot 1 and 2
3: To splitter and onto GPU 3 slot 1 and 2
4: To splitter and onto GPU 1/2 slot 3
5: Direct to GPU 3 slot 3

After reading some online advice, I cancelled my order for 18AWG splitters and placed an order for the 16AWG splitters below (at more than triple the price  ):

https://www.aliexpress.com/item/5PCS-LOT-High-Quality-25cm-Vieo-Card-8pin-Female-to-2-8pin-6P-2P-PCI-E/32767416770.html

[mshordja]

i have a question: how much you have get the cards ?

[marathonic]

i have a question: how much you have get the cards ?

The best price I could find was €3348 for the 6 cards (€558 each) including delivery to Ireland. As with most graphics cards these days, it's out of stock - delivery date to be confirmed soon.

[marathonic]

Investigating further with my very limited knowledge, I suspect the EVGA may be worth the extra outlay. The configurations I'm considering are as follows:

HX1200i - 5 PCIe slots available (£213.98):

1: To splitter and onto GPU 1 slot 1 and 2
2: To splitter and onto GPU 2 slot 1 and 2
3: To splitter and onto GPU 3 slot 1 and 2
4: To splitter and onto GPU 1/2 slot 3
5: Direct to GPU 3 slot 3


EVGA SuperNOVA 1200 P2 - 6 PCIe slots available (£262.99):

1: Direct to GPU 1 slot 1
2: Direct to GPU 2 slot 1
3: Direct to GPU 3 slot 1
4: To splitter and onto GPU 1 slot 2 and 3
5: To splitter and onto GPU 2 slot 2 and 3
6: To splitter and onto GPU 3 slot 2 and 3


It looks like the Corsair would have most cards powered by 1.5 PCIe slots whilst the EVGA would have all cards powered by 2 PCIe slots. Am I looking at this correctly?

[marathonic]

Amazon have removed the EVGA SuperNOVA 1200 P2 for £263.99 pre-order but I see it available to back-order with Novatech for £259.99.

I'll go ahead and order from there if confirmed that it's definitely the option to go for.

[marathonic]

Has anyone any opinions on this? Also, any experience on how long Novatech take when backordering items (I assume this is a 'how long is a piece of string' question)